single write to digital port

[markjoe]

Hi all,

A bit embarrassed to ask but I have a simple question. Is there, BTW, a general document about DAQMX, not just help pages. I always miss the overview and have to look in the examples. This works as long the examples match your goal, otherwise I start trying around. Suggestions are welcome.

To end a digital out session I want to write all 1's to the 32 bit port p0 of a PCI-6229. See attached pic. Now,

1: do I first start the task and then write data? Or write data and then start?

2: do I have to 'wait until done' before stopping and clearing?

your answers are appreciated!

Mark

[Dennis_Knutson · Accepted solution]

For a general overview, see the Getting Started With DAQmx page.

In your example, it's fine to first start the task and then write the data.

It's not always necessary to do a Is Task Done. When you have a static write like in your example, you don't need it. If you were doing a continuous, hardware timed generatation, then it would be appropriate.